براغي ذات رأس أسطواني M3-0.5 X 40mm | محرك سداسي داخلي | كامل الخيط | فولاذ مقاوم للصدأ 316 (400/عبوة)

The hex socket drive grips the Allen key perfectly, and the 316 stainless finish is smooth with no burrs. I used these in a jig build and all 400 seated cleanly without a single stripped thread.

Wanted some decent 316 stainless for a small robotics jig, and these fully threaded 40mm screws fit perfectly. They drove in smooth without any galling, and the hex socket held tight with no stripping.

The hex socket drive on these M3s bites perfectly with my Allen key, no stripping even when I torqued them down tight on a jig. The 316 stainless finish looks clean and feels solid—40mm length gave me just enough thread engagement for a 12mm plate stack.